EP1935721B1 - Dispositif de vue indirecte de véhicule - Google Patents

Dispositif de vue indirecte de véhicule Download PDF

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Publication number
EP1935721B1
EP1935721B1 EP20070024417 EP07024417A EP1935721B1 EP 1935721 B1 EP1935721 B1 EP 1935721B1 EP 20070024417 EP20070024417 EP 20070024417 EP 07024417 A EP07024417 A EP 07024417A EP 1935721 B1 EP1935721 B1 EP 1935721B1
Authority
EP
European Patent Office
Prior art keywords
curvature part
gradually
varying
constant
color filter
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
EP20070024417
Other languages
German (de)
English (en)
Other versions
EP1935721A1 (fr
Inventor
Hiroshi Uematsu
Toshihiro Hashimoto
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Honda Motor Co Ltd
Original Assignee
Honda Motor Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2007311353A external-priority patent/JP2008174219A/ja
Application filed by Honda Motor Co Ltd filed Critical Honda Motor Co Ltd
Publication of EP1935721A1 publication Critical patent/EP1935721A1/fr
Application granted granted Critical
Publication of EP1935721B1 publication Critical patent/EP1935721B1/fr
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R1/00—Optical viewing arrangements; Real-time viewing arrangements for drivers or passengers using optical image capturing systems, e.g. cameras or video systems specially adapted for use in or on vehicles
    • B60R1/02—Rear-view mirror arrangements
    • B60R1/08—Rear-view mirror arrangements involving special optical features, e.g. avoiding blind spots, e.g. convex mirrors; Side-by-side associations of rear-view and other mirrors
    • B60R1/081—Rear-view mirror arrangements involving special optical features, e.g. avoiding blind spots, e.g. convex mirrors; Side-by-side associations of rear-view and other mirrors avoiding blind spots, e.g. by using a side-by-side association of mirrors
    • B60R1/082—Rear-view mirror arrangements involving special optical features, e.g. avoiding blind spots, e.g. convex mirrors; Side-by-side associations of rear-view and other mirrors avoiding blind spots, e.g. by using a side-by-side association of mirrors using a single wide field mirror or an association of rigidly connected mirrors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R1/00—Optical viewing arrangements; Real-time viewing arrangements for drivers or passengers using optical image capturing systems, e.g. cameras or video systems specially adapted for use in or on vehicles
    • B60R1/02—Rear-view mirror arrangements
    • B60R1/08—Rear-view mirror arrangements involving special optical features, e.g. avoiding blind spots, e.g. convex mirrors; Side-by-side associations of rear-view and other mirrors
    • B60R1/083—Anti-glare mirrors, e.g. "day-night" mirrors
    • B60R1/085—Anti-glare mirrors, e.g. "day-night" mirrors using a combination of interchangeable reflecting surfaces, e.g. reversible mirrors

Definitions

  • the present invention relates to an indirect visual device of a vehicle with the features of the preamble part of claim 1, for example, a side mirror which provides a side or rear visual field with respect to a vehicle by means of a reflecting mirror.
  • a mirror surface of an indirect visual device in a vehicle has a substantially constant radius of curvature.
  • an indirect visual device e.g., a side mirror
  • the visible range obtained by the mirror surface is restricted. Therefore, a modification has been proposed, in which the radius of curvature is partially varied, so as to enlarge the visible range (see, for example, Japanese Unexamined Patent Application, First Publication No. H8-108800 .
  • the mirror surface of the disclosed indirect visual device has a constant curvature part 101, which has a substantially constant radius of curvature, and a gradually-varying curvature part 102, which joins an end of the constant curvature part 101 and whose radius of curvature gradually decreases toward an end of this part, so as to observe a wide-angle range, which cannot be easily observed via the constant curvature part 101.
  • the constant curvature part 101 and the gradually-varying curvature part 102 are not separated from each other, and the boundary therebetween is visually unclear. Therefore, it is difficult to judge whether each image reflected on the mirror surface is obtained through the constant curvature part 101 or the gradually-varying curvature part 102, and thus difficult to accurately judge the direction or distance with respect to a subject observed through the mirror surface.
  • Document US 2004/190166 A1 discloses an indirect visual device with all features of the preamble of claim 1, wherein a demarcation element such as a becel is provided between the constant curvature part and the gradually varying curvature part, and wherein the constant curvature part and/or the gradually varying curvature part comprise a variable reflectance electro-optic element such as an electrochromic mirror.
  • an object of the present invention is to provide an indirect visual device of a vehicle, for helping an occupant of the vehicle, who looks at a relevant mirror surface, to easily judge whether the occupant observes a subject through a constant curvature part or a gradually-varying curvature part.
  • the present invention provides an indirect visual device (e.g., a door mirror 10 in an embodiment explained later) of a vehicle, comprising:
  • the constant curvature part and the gradually-varying curvature part have different reflection forms from each other, it is possible to easily judge whether the present vision is obtained through the constant curvature part or the gradually-varying curvature part on the mirror surface, in accordance with the difference in the reflection form. Therefore, the occupant can more accurately perform judgment based on the present vision through the indirect visual device.
  • a polarizing film (e.g., a polarizing film 17 in the embodiment) is provided at the constant curvature part. Accordingly, diffuse reflection can be removed using the polarizing film, thereby effectively reducing the glare of light. In addition, the occupant can easily judge whether the area (on the reflecting mirror) which the occupant presently observes belongs to the constant curvature part or the gradually-varying curvature part, in accordance with presence or absence of diffuse reflection.
  • the polarizing film is provided at the constant curvature part. Therefore, major indirect vision by means of the constant curvature part can be a clear vision without diffuse reflection, through the polarizing film. In addition, it is possible to remove inconvenience in occupant's observation due to a combination of the gradually-varying curvature part and the polarizing film.
  • a color filter (e.g., a color filter 18 in the embodiment) is provided at the gradually-varying curvature part. Accordingly, the wavelength of the reflected light can be converted through the color filter, thereby improving easiness in occupant's observation, and the occupant can easily judge whether the area (on the reflecting mirror) which the occupant presently observes belongs to the constant curvature part or the gradually-varying curvature part, in accordance with a variation in color.
  • the color filter is provided at the gradually-varying curvature part, a peripheral visual field, which is reflected in the gradually-varying curvature part and has a distortion, can be more easily recognized.
  • a polarizing film e.g., a polarizing film 17 in the embodiment
  • a color filter e.g., a color filter 18 in the embodiment
  • diffuse reflection in the constant curvature part can be removed, and simultaneously, in the gradually-varying curvature part, the wavelength of the reflected light can be converted through the color filter.
  • the occupant can more easily judge whether the area (on the reflecting mirror) which the occupant presently observes belongs to the constant curvature part or the gradually-varying curvature part, in accordance with presence or absence of diffuse reflection, and a variation in color.
  • the color filter has spectral characteristics, whose center wavelength range is 500 to 560 nm.
  • Such a color filter has a high luminous efficiency regardless of daylight or scotopic vision, and thus it can make the occupant recognize a clear and bright image reflected in the reflecting mirror, regardless of day or night, weather conditions, or the like.
  • Fig. 1 is a perspective view of a part in a vehicle, which employs a door mirror 10 as a first embodiment of the indirect visual device in accordance with the present invention.
  • Fig. 2 includes a front view (A) of the door mirror 10, and a sectional view (B) obtained when cutting a reflecting mirror 11 of the door mirror 10 into two parts along the horizontal direction.
  • reference numeral 14 indicates a housing for holding the reflecting mirror 11 and a mirror supporting mechanism (not shown) of the door mirror 10.
  • an approximately two-third area, measured from the inner end (closer to the interior of the vehicle) in the vehicle's width direction toward the other end on the opposite side, is defined as a constant curvature part 12 having a substantially constant radius of curvature with respect to the mirror surface, and the remaining area on the outer side in the vehicle's width direction is defined as a gradually-varying curvature part 13, whose radius of curvature gradually decreases toward the outer end (i.e., on the side of the housing 14).
  • the main reflecting function of the constant curvature part 12 and the gradually-varying curvature part 3 is implemented by a metal layer 15, which is the bottom (i.e., lowest) layer.
  • the entire surface of the reflecting mirror 11 is covered with a glass plate 16.
  • a polarizing film 17 and a color filter 18 are provided, which respectively correspond to the constant curvature part 12 and the gradually-varying curvature part 13.
  • Fig. 3 is a schematic view for explaining the function of the door mirror 16, when observing a road surface 20, which includes a water film 19 such as a (rain) puddle, through the polarizing film 17 of the constant curvature part 12.
  • the polarizing film 17 of the constant curvature part 12 cuts off s-polarized light, included in light which was irregularly reflected by the water film 19 or the like on the road surface 20, thereby reducing reflection on the water film 19 or the like, or relevant glittering.
  • the polarizing film 17 of the constant curvature part 12 can also reduce strong sunlight during the day, headlights at night, or diffuse (or irregular) reflection due to light reflected by snow, or the like, thereby improving visibility.
  • Fig. 4 shows a relative (or spectral) luminous efficiency curve A with respect to daylight vision, and a relative luminous efficiency curve B with respect to scotopic vision.
  • the maximum luminous efficiency is obtained at a wavelength of approximately 555 nm
  • the maximum luminous efficiency is obtained at a wavelength of approximately 507 nm.
  • the color filter 18 employed in the gradually-varying curvature part 13 has spectral characteristics, whose center wavelength range is set to 500 to 560 nm, in which the relative luminous efficiency is relatively high in either daylight vision or scotopic vision. Therefore, the gradually-varying curvature part 13 can make the relevant occupant recognize a clear and bright reflected image, regardless of day or night, weather conditions, or the like.
  • a clear rear visual field which has less distortion and provides a superior sense of distance, can be obtained via the constant curvature part 12, which has a large area and is closer to the interior of the vehicle.
  • the polarizing film 17 is provided at the constant curvature part 12, less diffuse reflection occurs, and thus a rear visual field having a high contrast can be provided. Therefore, in the constant curvature part 12, an occupant who looks at the reflecting mirror 11 does not receive much glare, and additionally, the occupant can easily recognize each line or character drawn on the road surface, or a state of the driver (i.e., the driver's eyes or movement) of a vehicle which follows the present vehicle.
  • the gradually-varying curvature part 13 has the color filter 18, which has spectral characteristics, whose center wavelength range is set to 500 to 560 nm. Therefore, a bright visual field having a high luminous efficiency can be obtained regardless of daylight or scotopic vision.
  • the occupant can easily and accurately judge whether the area which the occupant presently observes belongs to the constant curvature part 12 or the gradually-varying curvature part 13, in accordance with presence or absence of diffuse reflection, and a variation in color.
  • parts (A) and (B) show a comparative example (which has been briefly explained before, as a conventional example), in which the constant curvature part 101 and the gradually-varying curvature part 102 are provided, and over the constant curvature part 102 and the gradually-varying curvature part 102, a color filter 105 is provided on a glass plate 104, which covers the front surface of a metal film 103.
  • the color filter 105 uniformly reduces light in a wide wavelength range. If coloring concentration of the color filter 105 is increased so as to effectively reduce the glare of light, the entire visual field becomes dark.
  • the boundary therebetween is indefinite.
  • the boundary therebetween is definite.
  • the color filter 18 at the gradually-varying curvature part 13 has spectral characteristics, whose center wavelength range is 500 to 560 nm, a visual field can be obtained, by which the relevant occupant can clearly and easily observe each object, while providing a sufficient effect of reducing the glare of light by means of the gradually-varying curvature part 13.
  • the polarizing film 17 and the color filter 18 are each provided on the metal film 15, and the glass plate 16 is further disposed on them.
  • the glass plate 16 may be disposed on the metal film 15, and the polarizing film 17 and a color filter (not shown) may be further disposed thereon.
  • the polarizing film 17 is provided at the constant curvature part 12 and the color filter 18 is provided at the gradually-varying curvature part 13 in which there is image distortion. This is most preferable in consideration of the visibility of each reflected image.
  • FIG. 7 A second example (not being an embodiment of the present invention) will be explained below with reference to Figs. 7 and 8 . Similar to the first embodiment, an indirect visual device is applied to a door mirror 10A of a vehicle in the present example.
  • Fig. 7 is a schematic view for explaining the function of a reflecting mirror 11 in the door mirror 10A.
  • the constant curvature part 12 an approximately two-third area, measured from the inner end in the vehicle's width direction toward the other end on the opposite side, is defined as the constant curvature part 12, and the remaining area on the outer side in the vehicle's width direction is defined as the gradually-varying curvature part 13, similar to the first embodiment, whose radius of curvature gradually decreases toward the outer end.
  • a color filter 18 is provided at the constant curvature part 12, wherein the filter has spectral characteristics, whose center wavelength range is set to 500 to 560 nm, and (ii) an angular visual field control film 30 is provided at the gradually-varying curvature part 13, wherein the state of the film is switched between visible and invisible states depending on the viewing angle.
  • the angular visual field control film 30 is made by incorporating fine light restricting plates, which are inclined at a specific angle, into a film made of PET (poly (ethylene terephthalate)).
  • the light restricting plates (not shown) have an inclined angle rotated around the vertical axis with respect to the gradually-varying curvature part 13.
  • the light restricting plates incorporated in the angular visual field control film 30 are inclined at an angle which almost matches the viewing angle of an eye of an occupant who sits on the driver's seat, where the eye is distant from the door mirror 10A in comparison with the other eye (of the occupant) which is closer to the door mirror 10A. That is, the light restricting plates are inclined from the viewing angle of the other eye of the occupant.
  • the image on the reflecting mirror 11 is visible through the angular visual field control film 30 (i.e., the light restricting plates) from the left eye El of the driver, but is invisible from the right eye Er by means of the angular visual field control film 30 (i.e., the light restricting plates).
  • the image on the reflecting mirror 11 is invisible from the left eye El, and is visible only from the right eye Er.
  • Fig. 8 includes an image (A) obtained when the driver looks at the door mirror 10A on the right side through the left eye, an image (B) obtained when the driver looks at the same door mirror 10A through the right eye, and an image (C) which is actually recognized through both eyes.
  • the reflected image is invisible through the right eye, as shown by the shaded part in the image (B) of Fig. 8 .
  • the relevant occupant recognizes a double image (see overlapped images I1 and 12) due to binocular parallax.
  • a single image I is always recognized by the relevant occupant.
  • a clear rear visual field which has less distortion and provides a superior sense of distance, can be obtained via the constant curvature part 12, which has a large area and is closer to the interior of the vehicle.
  • the color filter 18 having spectral characteristics whose center wavelength range is 500 to 560 nm, is provided at the constant curvature part 12, a bright visual field having a high luminous efficiency can be obtained regardless of daylight or scotopic vision.
  • a wide-angle visual field from the back to each side of the vehicle can be obtained by means of the gradually-varying curvature part 13.
  • the gradually-varying curvature part 13 has the angular visual field control film 30, a clear rear visual field can be obtained, which has no double image (due to binocular parallax) as described above.
  • the curvature greatly varies toward the outer end in the width direction of the vehicle. Therefore, images of a target object through the right and left eyes do not coincide with each other, and a double image of the target object must be recognized.
  • the door mirror 10A employing the angular visual field control film 30 in the gradually-varying curvature part 13 such a problem can be effectively solved.
  • the constant curvature part 12 and the gradually-varying curvature part 13 have different reflection forms from each other by means of the color filter 18 and the angular visual field control film 30. Therefore, the relevant occupant can easily and accurately judge whether the area which the occupant presently observes belongs to the constant curvature part 12 or the gradually-varying curvature part 13.
  • the angular visual field control film 30 is invisible from an eye (of the relevant occupant) which is relatively close to the film, while it is visible from the other eye which is relatively distant from the film. Therefore, the occupant can more easily observe a target image.
  • the color filter 18 and the angular visual field control film 30 are respectively provided at the constant curvature part 12 and the gradually-varying curvature part 13.
  • an angular visual field control film 30 and a color filter 18 may be respectively provided at the constant curvature part 12 and the gradually-varying curvature part 13.
  • An indirect visual device (10) of a vehicle includes a reflecting mirror (1) including a constant curvature part (12), which has a substantially constant radius of curvature over the mirror surface, and a gradually-varying curvature part (13), which joins the constant curvature part, and whose radius of curvature gradually decreases toward an end of this part.
  • the constant curvature part and the gradually-varying curvature part have different reflection forms from each other.
  • a polarizing film (17) is provided at the constant curvature part, and a color filter (18) is provided at the gradually-varying curvature part.
  • the color filter has spectral characteristics, whose center wavelength range is 500 to 560 nm.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Mechanical Engineering (AREA)
  • Rear-View Mirror Devices That Are Mounted On The Exterior Of The Vehicle (AREA)
  • Optical Elements Other Than Lenses (AREA)

Claims (2)

  1. Dispositif de vue indirecte (10) d'un véhicule, comprenant :
    un miroir réfléchissant (11) incluant une partie de courbure constante (12), qui a un rayon de courbure sensiblement constant sur la surface du miroir, et une partie de courbure à variation progressive (13), qui rejoint la partie de courbure constante (12), et dont le rayon de courbure diminue progressivement vers une extrémité de cette partie, dans lequel
    la partie de courbure constante (12) et la partie de courbure à variation progressive (13) ont des formes de réflexion différentes l'une de l'autre,
    caractérisé en ce que
    un film de polarisation (17) est prévu au niveau de la partie de courbure constante (12) ; et
    un filtre couleur (18) est prévu au niveau de la partie de courbure à variation progressive (13).
  2. Dispositif de vue indirecte (10) selon la revendication 1,
    caractérisé en ce que :
    le filtre couleur (18) a des caractéristiques spectrales, dont la gamme de longueurs d'onde centrale va de 500 à 560 nm.
EP20070024417 2006-12-19 2007-12-17 Dispositif de vue indirecte de véhicule Expired - Fee Related EP1935721B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2006341301 2006-12-19
JP2007311353A JP2008174219A (ja) 2006-12-19 2007-11-30 車両の間接視認装置

Publications (2)

Publication Number Publication Date
EP1935721A1 EP1935721A1 (fr) 2008-06-25
EP1935721B1 true EP1935721B1 (fr) 2009-12-02

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP20070024417 Expired - Fee Related EP1935721B1 (fr) 2006-12-19 2007-12-17 Dispositif de vue indirecte de véhicule

Country Status (1)

Country Link
EP (1) EP1935721B1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009009379B3 (de) * 2009-02-18 2010-07-01 Mekra Lang Gmbh & Co. Kg Spiegelanordnung für Fahrzeuge sowie Fahrzeug mit einer solchen Spiegelanordnung

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2552267C3 (de) * 1975-11-21 1979-07-05 Arthur 6330 Wetzlar Seibert Rückblickspiegel für Straßenfahrzeuge, insbesondere Kraftfahrzeuge
DE2915580A1 (de) * 1979-04-18 1980-10-30 Walter Rieder Toterwinkelerfassungsrueckblickspiegel fuer fahrzeuge
US5668663A (en) * 1994-05-05 1997-09-16 Donnelly Corporation Electrochromic mirrors and devices
DE19627417C1 (de) * 1996-07-08 1997-10-23 Daimler Benz Ag Außenspiegel an einem Kraftfahrzeug
US6717712B2 (en) * 2000-01-06 2004-04-06 Donnelly Corporation Exterior mirror plano-auxiliary reflective element assembly

Also Published As

Publication number Publication date
EP1935721A1 (fr) 2008-06-25

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